The second half of the period was a serious introduction to momentum (meaning, equation, sample problems). The first half consisted of the ESPN video on the story of Preston Plevretes, a former college football player affected profoundly by second impact syndrome. It is a tough 12 minutes to watch and I purposely keep the lights dim for awhile as students discuss it as there are often tears shed. You could hear a pin drop while the video plays. Students often mention that this should be viewed by athletes BEFORE the season starts as they would be more likely to report concussion symptoms.